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PID Symbol for Emergency Stops

PID Symbol for Emergency Stops

PID Symbol for Emergency Stops

(OP)
Has anyone placed emergency stop buttons (with signal back to dcs)on their P&ID's for motor control, next to an HOA?  Would you use something for the symbol identification like XSC for a user defined control switch?

RE: PID Symbol for Emergency Stops

HS is common for hand switch.  If used I would write ESD, Trip, or a similar description in the upper right of the bubble.

RE: PID Symbol for Emergency Stops

Perhaps this should be a separate thread, but your question got me thinking - we receive P&IDs with E-Stop shown as a function inside the DCS, that is, a pick on the screen that should stop a process immediately.  I know I prefer to have only hardwired switches using the name "E-stop," but I wonder if there is a code requirement to back up my preference.

...John

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